【单选题】通过对基金持股的( )分析,可以看出基金是偏好大盘股投资、中盘股投资还是小盘股投资
【单选题】通过对基金持股的( )分析,可以看出基金是偏好大盘股投资、中盘股投资还是小盘股投资。
【单选题】在下列关于气相色谱分析中如何选择柱温的最佳操作条件的叙述中错误的是()。
A.
一般选用柱温的原则是在被分析物质组分的平均沸点左右或稍低一点为佳
【简答题】阅读理解。 Last Sunday, I went to the park with my parents. There were many people there. I saw some boys and girls. They sang. Some English songs. Who was the boy in green? He was David. He played footbal...
【多选题】下列关于气相色谱的说法正确的是
A.
在灵敏度允许的情况下,应尽量采取较低的桥路电流
D.
在使最难分离的组分有符合要求的分离度前提下,以保留时间适宜及不拖尾为度,尽可能采用较低柱温
【单选题】以下哪一项,不是设置柱温时需要考虑的?
B.
不能低于固定液的最低使用温度,防止其在色谱柱中冷凝
【简答题】VI、阅读短文,并根据短文将句子补充完整。 Last summer, I went to Taiwan with my parents. I went to see Sun Moon Lake. The lake was very beautiful. There were many people there. I took many photos on my mobile. The fruits...